Driving circuit and terminal

Abstract

The invention relates to a driving circuit and a terminal. The driving circuit comprises a BOOST circuit, a first sub-driving circuit and a second sub-driving circuit. The BOOST circuit is respectively connected with the first sub-drive circuit and a battery of the terminal, the first sub-drive circuit is also connected with a low-voltage conversion circuit in the terminal, and the second sub-drive circuit is respectively connected with the battery and the low-voltage conversion circuit; the BOOST circuit is used for converting the output voltage of the battery into a first voltage; the first voltage is greater than the output voltage; and the first sub-driving circuit is used for switching on a path between the battery and the low-voltage conversion circuit according to the first voltage under the condition that the second sub-driving circuit is switched off. By adopting the driving circuit provided by the invention, the efficiency of supplying power to the load in the terminal can be improved.

Description

Technical Field

[0001] This application relates to the field of power supply technologies, and particularly to a driving circuit and a terminal. Background Art

[0002] Currently, since the output voltage of the Power Management IC (PMIC) in a terminal needs to match the operating voltage of the load, most of the output voltages of the PMIC are voltages lower than 5V.

[0003] In the traditional technology, a conversion circuit is led out from the pins of the PMIC to convert the output voltage of the battery into a voltage lower than 5V to supply power to the load of the terminal.

[0004] However, there is a problem of low power supply efficiency for the load in the terminal in the traditional technology. Summary of the Invention

[0005] Embodiments of this application provide a driving circuit and a terminal, which can improve the power supply efficiency for the load in the terminal.

[0006] In a first aspect, embodiments of this application provide a driving circuit, which includes: a BOOST circuit, a first sub-driving circuit, and a second sub-driving circuit; the BOOST circuit is respectively connected to the first sub-driving circuit and the battery of the terminal, the first sub-driving circuit is further connected to the low-voltage conversion circuit in the terminal, and the second sub-driving circuit is respectively connected to the battery and the low-voltage conversion circuit; the BOOST circuit is configured to convert the output voltage of the battery into a first voltage; the first voltage is greater than the output voltage; the first sub-driving circuit is configured to conduct the path between the battery and the low-voltage conversion circuit according to the first voltage when the second sub-driving circuit is turned off.

[0007] In a second aspect, embodiments of this application provide a terminal, which includes: the driving circuit and the low-voltage conversion circuit as described in the first aspect above, the driving circuit is respectively connected to the battery and the low-voltage conversion circuit; the low-voltage conversion circuit is configured to step down the output voltage of the battery through the driving circuit and then supply power to the load.

[0008] The above-mentioned drive circuit and terminal, the drive circuit includes a BOOST circuit, a first sub-drive circuit and a second sub-drive circuit, the BOOST circuit is respectively connected to the first sub-drive circuit and the battery of the terminal, the first sub-drive circuit is also connected to the low-voltage conversion circuit in the terminal, and the second sub-drive circuit is respectively connected to the battery and the low-voltage conversion circuit. Since the BOOST circuit can convert the output voltage of the battery into a first voltage greater than the output voltage, and the BOOST circuit does not generate a voltage drop in the process of boosting the output voltage of the battery, the problem of the first sub-drive circuit taking too long to turn on due to the first voltage output by the BOOST circuit being lower than the output voltage of the battery is avoided. In this way, when the second sub-drive circuit is cut off, the first sub-drive circuit can quickly turn on the path between the battery and the low-voltage conversion circuit when receiving the first voltage, thereby improving the conduction efficiency of the path between the battery and the low-voltage conversion circuit, so that the low-voltage conversion circuit can quickly convert the output voltage of the battery into a low voltage required to meet the terminal load, thereby improving the efficiency of powering the load in the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is a schematic diagram of a power output stage circuit in conventional technology;

[0011] Figure 2 is a schematic diagram of a driving circuit in one embodiment;

[0012] Figure 3 is a schematic diagram of a driving circuit in another embodiment;

[0013] Figure 4 is a schematic diagram of a driving circuit in another embodiment;

[0014] Figure 5 is a schematic diagram of a driving circuit in another embodiment;

[0015] Figure 6 is a schematic diagram of a driving circuit in another embodiment;

[0016] Figure 7 is a schematic diagram of a driving circuit in another embodiment;

[0017] Figure 8 is a schematic diagram of a driving circuit in another embodiment;

[0018] Fig. 9 is a schematic diagram of a driving circuit in another embodiment;

[0019] Description of reference numerals:

[0020] Driving circuit: 001; Low voltage conversion circuit: 002; Battery: 003;

[0021] BOOST circuit: 01; First sub-drive circuit: 02; Second sub-drive circuit: 03;

[0022] First control circuit: 21; First NMOS transistor: 22; Second control circuit: 23;

[0023] Fifth NMOS transistor: 24; First switch circuit: 211; Second switch circuit: 212;

[0024] First driver: 2111; First PMOS tube: 2112; Third driver: 2113;

[0025] The second PMOS tube: 2114; The third PMOS tube: 2115; The second driver: 2121;

[0026] The second NMOS tube: 2122; The fourth driver: 2123; The third NMOS tube: 2124;

[0027] Fourth NMOS tube: 2125; Fifth driver: 231; Fourth PMOS tube: 232;

[0028] Sixth NMOS tube: 233. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Usually, when powering the load in the terminal, the power output stage circuit of the power management integrated circuit (PMIC) in the terminal controls the conduction and cutoff of the battery and the buck circuit in the PMIC, thereby providing an adaptive working voltage for the load. Figure 1As shown, the power output stage circuit is achieved by setting an NMOS tube in the upper bridge circuit and an NMOS tube in the lower bridge circuit. When the upper bridge circuit is set to a high voltage and the lower bridge circuit is set to a low voltage, the NMOS tube in the upper bridge circuit can be turned on, thereby turning on the path between the battery and the step-down circuit, and transmitting the output voltage of the battery to the step-down circuit. However, based on the conduction principle of the NMOS tube, the gate voltage needs to be greater than the source voltage to achieve the conduction of the NMOS tube. Therefore, a bootstrap circuit needs to be set in the upper bridge circuit to increase the gate voltage of the NMOS tube in the upper bridge circuit. However, due to the conduction voltage drop of the diode in the bootstrap circuit, the potential of the bootstrap capacitor in the bootstrap circuit will be lower than the output voltage of the battery, and the NMOS tube in the lower bridge circuit needs to be fully turned on before the NMOS tube in the upper bridge circuit can be turned on, which makes the time for outputting the battery voltage to the buck circuit too long, which is not conducive to the buck circuit outputting a low voltage, affecting the frequency of the buck circuit, and is not conducive to the low voltage operation and high frequency operation of the buck circuit, reducing the efficiency of powering the load in the terminal. In addition, due to the large size of the power-stage NMOS tube, it is not suitable to integrate the bootstrap circuit into the circuit using semiconductor technology, and the bootstrap circuit needs to be externalized to the NMOS, then the PMIC needs to add a pin to connect the bootstrap circuit, thereby increasing the area occupied by the power output stage circuit, which is not suitable for the circuit setting in the terminal. Based on this, the present application proposes a driving circuit that can improve the efficiency of powering the load in the terminal.

[0031] The technical solutions involved in the embodiments of the present disclosure are introduced below in combination with the scenarios to which the embodiments of the present disclosure are applied.

[0032] In one embodiment, Figure 2 As shown, a driving circuit 001 is provided, comprising: a BOOST circuit 01, a first sub-driving circuit 02 and a second sub-driving circuit 03; the BOOST circuit 01 is respectively connected to the first sub-driving circuit 02 and a battery 003 of a terminal, the first sub-driving circuit 02 is also connected to a low-voltage conversion circuit 002 in the terminal, and the second sub-driving circuit 03 is respectively connected to the battery 003 and the low-voltage conversion circuit 002; the BOOST circuit 01 is used to convert the output voltage of the battery 003 into a first voltage, the first voltage being greater than the output voltage; the first sub-driving circuit 02 is used to conduct a path between the battery 003 and the low-voltage conversion circuit 002 according to the first voltage when the second sub-driving circuit 03 is cut off.

[0033] It should be noted that, in order to make the voltage output by the battery 003 of the terminal match the working voltage of the load in the terminal, the voltage output by the battery 003 can usually be converted into a supply voltage lower than 5V by the power management integrated circuit (Power Management IC, PMIC) in the terminal. Therefore, a low-voltage conversion circuit 002, such as a BUCK circuit, for reducing the voltage of the battery 003 can be set in the PMIC; further, the drive circuit 001 can be set in the PMIC as a switch to control the conduction and cutoff of the path between the battery 003 and the low-voltage conversion circuit 002. In this embodiment, the drive circuit 001 may include a BOOST circuit 01, a first sub-drive circuit 02, and a second sub-drive circuit 03. The drive circuit 001 can control the conduction and cutoff of the path between the battery 003 and the low-voltage conversion circuit 002 by controlling the BOOST circuit 01, the first sub-drive circuit 02, and the second sub-drive circuit 03. Among them, the BOOST circuit 01 is a switching DC boost circuit, and the input voltage can be boosted by the BOOST circuit 01 to obtain a voltage higher than the input voltage.

[0034] In this embodiment, the battery 003 of the terminal can be connected to one end of the BOOST circuit 01 to input the output voltage of the battery 003 into the BOOST circuit 01, so that the BOOST circuit 01 can boost the output voltage of the battery 003 to obtain a first voltage, thereby inputting the first voltage into the first sub-drive circuit 02 connected to the other end of the BOOST circuit 01, and then when the second sub-drive circuit 03 is cut off, the first sub-drive circuit 02 is turned on according to the first voltage, and the path between the battery 003 and the low-voltage conversion circuit 002 is turned on, so that the low-voltage conversion circuit 002 can step down the output voltage of the battery 003 and supply power to the load in the terminal. It should be noted that, in this embodiment, the second sub-drive circuit 03 is cut off, which means that the output voltage of the battery 003 cannot be transmitted to the low-voltage conversion circuit 002 through the second sub-drive circuit 03, thereby disconnecting the path between the second sub-drive circuit 03 and the low-voltage conversion circuit 02. It can be understood that by periodically controlling the on and off of the first sub-driving circuit 02 and the on and off of the second sub-driving circuit 03, the output voltage of the battery can be periodically output to the low voltage conversion circuit to control the operating frequency of the low voltage conversion circuit.

[0035] It should be noted that the working principle of the low voltage conversion circuit 002 is to periodically control the conduction and cutoff of the low voltage conversion circuit 002 through a switch device or a switch circuit, thereby controlling the conduction and cutoff of the path between the battery 003 and the low voltage conversion circuit 002. When the switch circuit is turned on, the on-resistance inside the low voltage conversion circuit 002 is very small, and the current can pass through, and the current is stored through the filter capacitor, and the high frequency wave is filtered out through the low pass filter to ensure the stability of the output voltage of the low voltage conversion circuit 002; when the switch circuit is turned off, the on-resistance inside the low voltage conversion circuit 002 increases, the filter capacitor is discharged, and the low voltage conversion circuit 002 provides energy to the load. Therefore, the corresponding duty cycle can be set according to the working voltage of the load, so as to periodically control the first sub-drive circuit 02 to be turned on and the second sub-drive circuit 03 to be turned off according to the duty cycle, or the first sub-drive circuit 02 is controlled to be turned off and the second sub-drive circuit 03 is controlled to be turned on, thereby controlling the conduction and cutoff of the path between the battery 003 and the low voltage conversion circuit 002.

[0036] The above-mentioned driving circuit includes a BOOST circuit, a first sub-driving circuit and a second sub-driving circuit. The BOOST circuit is connected to the first sub-driving circuit and the battery of the terminal respectively. The first sub-driving circuit is also connected to the low-voltage conversion circuit in the terminal. The second sub-driving circuit is connected to the battery and the low-voltage conversion circuit respectively. Since the BOOST circuit can convert the output voltage of the battery into a first voltage greater than the output voltage, and the BOOST circuit does not generate a voltage drop in the process of boosting the output voltage of the battery, the problem of the first sub-driving circuit taking too long to turn on due to the first voltage output by the BOOST circuit being lower than the output voltage of the battery is avoided. In this way, when the second sub-driving circuit is cut off, the first sub-driving circuit can quickly turn on the path between the battery and the low-voltage conversion circuit when receiving the first voltage, thereby improving the conduction efficiency of the path between the battery and the low-voltage conversion circuit, so that the low-voltage conversion circuit can quickly convert the output voltage of the battery into a low voltage required to meet the terminal load, thereby improving the efficiency of powering the load in the terminal.

[0037] It is understandable that a plurality of metal-oxide semiconductor field effect transistors (MOSFET, MOS) can be generally provided in the driving circuit 001 to realize the conduction and cutoff of the driving circuit 001. In this embodiment, a MOS tube can be provided in the first sub-driving circuit 02 to conduct the path between the battery 003 and the low voltage conversion circuit 002. In one embodiment, as Figure 3As shown, the above-mentioned first sub-driving circuit 02 includes: a first control circuit 21 and a first NMOS tube 22; the first control circuit 21 is respectively connected to the BOOST circuit 01, the battery 003 and the first NMOS tube 22, and the first NMOS tube 22 is also respectively connected to the battery 003 and the low-voltage conversion circuit 002; the first sub-driving circuit 02 is used to turn on the path between the battery 003 and the low-voltage conversion circuit 002 according to the first voltage and the first control circuit 21 when the second sub-driving circuit 03 is turned off.

[0038] It should be noted that MOS tubes can generally be divided into PMOS tubes and NMOS tubes. In this embodiment, considering the design area of ​​the circuit in the terminal, an NMOS tube with better conduction characteristics can be selected in the first sub-driving circuit, thereby reducing the occupied area of ​​the driving circuit 001.

[0039] In this embodiment, the first sub-driving circuit 02 may include a first control circuit 21 and a first NMOS tube 22. By connecting one end of the BOOST circuit 01 to the battery 003, the BOOST circuit 01 can receive the output voltage of the battery 003, thereby boosting the output voltage of the battery 003 to obtain a first voltage. The BOOST circuit 01 can transmit the first voltage to the first control circuit 21. When receiving the first voltage, the first control circuit 21 can input the first voltage to the gate G of the first NMOS tube 22, so that the gate G voltage of the first NMOS tube 22 is greater than the source S voltage of the first NMOS tube 22, thereby turning on the first NMOS tube 22. Furthermore, when the first NMOS tube 22 is fully turned on, the path between the battery 003 and the low-voltage conversion circuit 002 is turned on, and the voltage of the first NMOS tube 22 is transmitted to the low-voltage conversion circuit 002.

[0040] It can be understood that, since the first NMOS is also connected to the battery 003, when the first NMOS tube 22 is fully turned on, the drain D voltage of the first NMOS tube 22 is the same as the source S voltage of the first NMOS tube 22, both of which are the output voltage of the battery 003. Therefore, when the first NMOS tube 22 is fully turned on, the drive circuit can transmit the output voltage of the battery 003 to the low-voltage conversion circuit 002.

[0041] In this embodiment, the first sub-driving circuit 02 can turn on the first NMOS transistor 22 through the first control circuit 21 according to the received first voltage when the second sub-driving circuit 03 is turned off, thereby opening the path between the battery 003 and the low voltage conversion circuit 002.

[0042] In this embodiment, the first sub-drive circuit includes a first control circuit and a first NMOS tube. The first sub-drive circuit is connected to the BOOST circuit, the battery and the first NMOS tube respectively. The first NMOS tube is also connected to the battery and the low-voltage conversion circuit respectively, so that the first control circuit can control the first NMOS tube to be turned on when receiving the first voltage, so that the first NMOS tube can transmit the output voltage of the power supply to the low-voltage conversion circuit. Then, the first sub-drive circuit can, when the second sub-drive circuit is cut off, conduct the path between the battery and the low-voltage conversion circuit according to the first voltage and the first control circuit, and transmit the output voltage of the battery to the low-voltage conversion circuit.

[0043] In the scenario where the first sub-driving circuit 02 conducts the path between the battery 003 and the low voltage conversion circuit 002 according to the first voltage and the first control circuit 21, the first control circuit 21 may include a first switch circuit 211 and a second switch circuit 212 to control the conduction and cutoff of the first NMOS tube 22 through the first switch circuit 211 and the second switch circuit 212. In one embodiment, Figure 4 As shown, the first control circuit 21 includes a first switch circuit 211 and a second switch circuit 212; the first switch circuit 211 is respectively connected to the battery 003, the BOOST circuit 01 and the first NMOS tube 22, the second switch circuit 212 is respectively connected to the battery 003 and the first NMOS tube 22, and one end of the second switch circuit 212 is grounded; the second switch circuit 212 is used to conduct the path between the second switch circuit 212 and the first NMOS tube 22 through the output voltage; the first switch circuit 211 is used to control the path between the first switch circuit 211 and the first NMOS tube 22 to be conducted through the first voltage when the path between the second switch circuit 212 and the first NMOS tube 22 is conducted, so as to conduct the path between the battery 003 and the low-voltage conversion circuit 002.

[0044] Among them, the first switch circuit 211 is a circuit for conducting the path between the battery 003 and the low voltage conversion circuit 002, and the second switch circuit 212 is a circuit for cutting off the path between the battery 003 and the low voltage conversion circuit 002. It can be understood that the first switch circuit 211 can drive the gate voltage of the first NMOS tube 22 to a high level, and the second switch circuit 212 can drive the gate voltage of the first NMOS tube 22 to a low level, so that by alternately controlling the first switch circuit 211 to be turned on or the second switch circuit 212 to be turned on, the forward drive and reverse drive of the first NMOS tube 22 are realized, thereby controlling the path between the first control circuit 21 and the first NMOS tube 22 to be turned on, and then when the path between the first control circuit 21 and the first NMOS tube 22 is turned on, the path between the battery 003 and the first NMOS tube 22 is turned on.

[0045] In this embodiment, the output voltage of the battery 003 can be transmitted to the second switch circuit 212 connected to the battery 003. When receiving the output voltage, the second switch circuit 212 can conduct the path between the second switch circuit 212 and the first NMOS tube 22; further, the voltage at one end of the first switch circuit 211 connected to the first NMOS tube 22 can be the same as the path voltage when the second switch circuit 212 is turned on. When the first switch circuit 211 receives the first voltage, since the voltage at one end of the first switch is the first voltage and the other end of the first switch is the same voltage as the path voltage of the second switch circuit 212, a voltage difference can be formed at both ends of the first switch circuit 211, so that the first switch circuit 211 can be turned on, so that the first switch circuit 211 can transmit the first voltage to the first NMOS tube 22, turn on the first NMOS tube 22, and then conduct the path between the battery 003 and the first NMOS tube 22.

[0046] In this embodiment, the first control circuit includes a first switch circuit and a second switch circuit. The first switch circuit is respectively connected to the battery, the BOOST circuit and the first NMOS tube, and the second switch circuit is respectively connected to the battery and the first NMOS tube. One end of the second switch circuit is grounded. Since the second switch circuit can conduct the path between the second switch circuit and the first NMOS tube by outputting a voltage, the first switch circuit can form a stable voltage difference between the two ends of the first switch circuit when receiving the first voltage, so that the first switch circuit is turned on, and then the first voltage can be transmitted to the first MMOS tube, turning on the first NMOS tube, so that the path between the battery and the low-voltage conversion circuit is turned on, thereby ensuring the reliability and stability of the conduction of the path between the battery and the low-voltage conversion circuit.

[0047] It should be noted that, in order to ensure that the output voltage of the battery 003 flowing through the MOS tube cannot exceed the maximum voltage of the MOS tube when the MOS tube is turned on, the MOS tube in the first switch circuit 211 can be selected to have a withstand voltage higher than the first voltage. Figure 5As shown, the first switch circuit 211 includes: a first driver 2111 and a first PMOS tube 2112; the first driver 2111 is respectively connected to the battery 003, the BOOST circuit 01 and the first PMOS tube 2112, and the first PMOS tube 2112 is also connected to the BOOST circuit 01 and the first NMOS tube 22. The second switch circuit 212 includes: a second driver 2121 and a second NMOS tube 2122; the first end of the second driver 2121 is respectively connected to the battery 003 and the second NMOS tube 2122, the second end of the second driver 2121 is grounded, the second NMOS tube 2122 and the first PMOS tube 2112 are connected to the first NMOS tube 22 through a common node, and one end of the second NMOS tube 2122 is grounded.

[0048] The first driver 2111 is used to drive the first PMOS tube 2112 to turn on, thereby driving the first switch circuit 211 to turn on, and the second driver 2121 is used to drive the second NMOS tube 2122 to turn on, thereby driving the second switch circuit 212 to turn on.

[0049] In this embodiment, when the low voltage conversion circuit 002 needs to obtain the voltage of the battery 003, the second driver 2121 can be controlled to set a high voltage, that is, the second driver 2121 outputs the output voltage of the battery 003. Since the source S of the second NMOS tube 2122 is grounded, when the second driver 2121 transmits the output voltage of the battery 003 to the gate G of the second NMOS tube 2122, the voltage difference between the gate G and the source S of the second NMOS tube 2122 is greater than 0, and the second NMOS tube 2122 can be turned on. When the second NMOS tube 2122 is fully turned on, the drain D of the second NMOS tube 2122 and the source S are the same voltage, that is, the voltage of the drain D of the second NMOS tube 2122 is 0.

[0050] It can be understood that, since the second NMOS tube 2122 and the first PMOS tube 2112 can be connected to the first NMOS tube 22 through a common node, when the voltage of the drain D of the second NMOS tube 2122 is 0, the voltage of one end of the first PMOS tube 2112 connected to the second NMOS tube 2122 is also 0. It should be noted that, in the embodiment of the present application, the PMOS tube and the NMOS tube can be connected in reverse, and the voltage of the drain D of the first PMOS tube 2112 is also 0.

[0051] Further, when the second NMOS tube 2122 is fully turned on, the first driver 2111 can be set to a low voltage, that is, the output voltage of the first driver 2111 is the output voltage of the battery 003. When the first driver 2111 transmits the output voltage of the battery 003 to the gate G of the first PMOS tube 2112, the output voltage of the gate G of the first PMOS tube 2112 is less than the first voltage of the source S, that is, the voltage difference between the gate G of the first PMOS tube 2112 and the source S is less than 0, and the first PMOS tube 2112 can be turned on; when the first PMOS tube 2112 is fully turned on, the drain D of the first PMOS tube 2112 is the same as the source S voltage, that is, the drain D voltage of the first PMOS tube 2112 is the first voltage. The first switch circuit 211 can transmit the first voltage to the gate G of the first NMOS tube 22 when the path between the second switch circuit 212 and the first NMOS tube 22 is turned on. Since the drain D of the first NMOS tube 22 is connected to the battery 003, during the conduction of the first NMOS tube 22, the source voltage of the first NMOS tube 22 can be pulled up to the output voltage of the battery 003 at the maximum, so that a voltage difference greater than 0 can be formed between the gate G and the source S of the first NMOS tube 22, turning on the first NMOS tube 22, thereby turning on the path between the battery 003 and the low-voltage conversion circuit 002.

[0052] Exemplarily, if the output voltage of the battery 003 is 5V, the output voltage of the battery 003 can be boosted to 9V through the BOOST circuit 01, that is, the first voltage is 9V. Further, the MOS tube can select a voltage with a withstand voltage of 12V, or the MOS tube can also select a voltage with a withstand voltage of 14V. This embodiment does not limit the withstand voltage of the MOS tube, as long as it is higher than the maximum voltage flowing through the MOS tube when it is turned on.

[0053] In this embodiment, the first switch circuit includes a first driver and a first PMOS tube, the first driver is connected to the battery, the BOOST circuit and the first PMOS tube respectively, and the first PMOS tube is also connected to the BOOST circuit and the first NMOS tube; the second switch circuit includes a second driver and a second NMOS tube, the first end of the second driver is connected to the battery and the second NMOS tube respectively, the second end of the second driver is grounded, the second NMOS tube and the first PMOS tube are connected to the first NMOS tube through a common node, and one end of the second NMOS tube is grounded, so that the first switch circuit can control the path between the first switch circuit and the first NMOS tube to be turned on by the first voltage when the path between the second switch circuit and the first NMOS tube is turned on, so that the path between the battery and the low-voltage conversion circuit is turned on.

[0054] It can be understood that the higher the breakdown voltage of the MOS transistor, the higher its cost. Therefore, two series-connected low-breakdown-voltage MOS transistors can be set in the first switching circuit 211 to avoid the problem that the conduction voltage of the MOS transistor is greater than its breakdown voltage. In another embodiment, as Figure 6 shown, the first switching circuit 211 includes: a third driver 2113, a second PMOS transistor 2114, and a third PMOS transistor 2115; the third driver 2113 is respectively connected to the battery 003, the BOOST circuit 01, and the second PMOS transistor 2114, the second PMOS transistor 2114 is also respectively connected to the BOOST circuit 01 and the third PMOS transistor 2115, the third PMOS transistor 2115 is also respectively connected to the battery 003 and the first NMOS transistor 22, and the second switching circuit 212 includes: a fourth driver 2123, a third NMOS transistor 2124, and a fourth NMOS transistor 2125; a first end of the fourth driver 2123 is respectively connected to the battery 003 and the fourth NMOS transistor 2125, a second end of the fourth driver 2123 is grounded, the third NMOS transistor 2124 is respectively connected to the fourth NMOS transistor 2125 and the battery 003, the third NMOS transistor 2124 and the third PMOS transistor 2115 are connected to the first NMOS transistor 22 through a common node, and one end of the fourth NMOS transistor 2125 is grounded.

[0055] Among them, the first switching circuit 211 may include a third driver 2113, and a series-connected second PMOS transistor 2114 and third PMOS transistor 2115, and the second switching circuit 212 may include a fourth driver 2123, and a series-connected third NMOS transistor 2124 and fourth NMOS transistor 2125. In this embodiment, when the low-voltage conversion circuit 002 needs to obtain the battery 003 voltage, the fourth driver 2123 can be controlled to set a high voltage, that is, the fourth driver 2123 outputs the output voltage of the battery 003. Since the source S of the fourth NMOS transistor 2125 is grounded, when the fourth driver 2123 delivers the output voltage of the battery 003 to the gate G of the fourth NMOS transistor 2125, the voltage difference between the gate G and the source S of the fourth NMOS transistor 2125 is greater than 0, so the fourth NMOS transistor 2125 can be turned on; furthermore, the source S voltage of the third NMOS transistor 2124 is also 0. Since the gate G of the third NMOS transistor 2124 is connected to the power supply, the gate G voltage of the third NMOS transistor 2124 is greater than the source S voltage of the third NMOS transistor 2124, so the third NMOS transistor 2124 is turned on, and then the drain D voltage of the third NMOS transistor 2124 is also 0.

[0056] It can be understood that, since the third NMOS tube 2124 and the third PMOS tube 2115 can be connected to the first NMOS tube 22 through a common node, when the voltage of the drain D of the third NMOS tube 2124 is 0, the voltage of one end of the third PMOS tube 2115 connected to the drain D of the third NMOS tube 2124 is also 0. It should be noted that the second PMOS tube 2114 and the third PMOS tube 2115 connected in series are reversely connected to the third NMOS tube 2124 and the fourth NMOS tube 2125 connected in series, that is, the drain D of the third PMOS tube 2115 is connected to the drain D of the third NMOS tube 2124, and therefore, the voltage of the drain D of the third PMOS tube 2115 is 0.

[0057] Furthermore, when the third NMOS tube 2124 is fully turned on, the third driver 2113 can be set to a low voltage, that is, the output voltage of the third driver 2113 is the output voltage of the battery 003. When the third driver 2113 transmits the output voltage of the battery 003 to the gate G of the second PMOS tube 2114, since the source S of the second PMOS tube 2114 is connected to the BOOST circuit 01, that is, the voltage of the source S of the second PMOS tube 2114 is the first voltage, the voltage difference between the gate G and the source S of the second PMOS tube 2114 is less than 0, and the second PMOS tube 2114 can be turned on; when the second PMOS tube 2114 is fully turned on, the drain D of the second PMOS tube 2114 is the same as the source S voltage, that is, the drain D voltage of the second PMOS tube 2114 is the first voltage; and then the source S voltage of the third PMOS tube 2115 is also the first voltage; since the gate G of the third PMOS tube 2115 is connected to the BOOST circuit 01, that is, the voltage of the source S of the second PMOS tube 2114 is the first voltage, the voltage difference between the gate G and the source S of the second PMOS tube 2114 is less than 0, and the second PMOS tube 2114 can be turned on; when the second PMOS tube 2114 is fully turned on, the drain D of the second PMOS tube 2114 is the same as the source S voltage, that is, the drain D voltage of the second PMOS tube 2114 is the first voltage; and then the source S voltage of the third PMOS tube 2115 is also the first voltage; When the third PMOS tube 2115 is connected to the power supply, the gate G voltage of the third PMOS tube 2115 is greater than the source S voltage of the third PMOS tube 2115, that is, the voltage difference between the gate G and the source S of the third PMOS tube 2115 is less than 0, so that the third PMOS tube 2115 can be turned on, and the drain D voltage of the third NMOS tube 2124 is also the first voltage; the first switch circuit 211 transmits the first voltage to the gate G of the first NMOS tube 22, then the gate G voltage of the first NMOS tube 22 is greater than the source S voltage of the first NMOS tube 22, that is, the voltage difference between the gate G and the source S voltage of the first NMOS tube 22 is greater than 0, then the first NMOS tube 22 is turned on, and then the path between the battery 003 and the low-voltage conversion circuit 002 is turned on.

[0058] In this embodiment, the first switch circuit includes a third driver, a second PMOS tube and a third PMOS tube; the third driver is connected to the battery, the BOOST circuit and the second PMOS tube respectively, the second PMOS tube is also connected to the BOOST circuit and the third PMOS tube respectively, and the third PMOS tube 2 is also connected to the battery and the first NMOS tube respectively; the second switch circuit includes a fourth driver, a third NMOS tube and a fourth NMOS tube, the first end of the fourth driver is connected to the battery and the fourth NMOS tube respectively, the second end of the fourth driver is grounded, the third NMOS tube is connected to the fourth NMOS tube and the battery respectively, the third NMOS tube and the third PMOS tube are connected to the first NMOS tube through a common node, and one end of the fourth NMOS tube is grounded, so that the first switch circuit can control the path between the first switch circuit and the first NMOS tube to be connected through the first voltage when the path between the second switch circuit and the first NMOS tube is connected, so that the path between the battery and the low-voltage conversion circuit is connected; in addition, since two low-voltage PMOS tubes are connected in series and two low-voltage NMOS tubes are connected in series in this embodiment, the above-mentioned high-voltage MOS tube can be replaced, thereby reducing the cost of the drive circuit.

[0059] It should be noted that in the drive circuit 001 provided in the embodiment of the present application, the first sub-drive circuit 02 is used to conduct the path between the battery 003 and the low-voltage conversion circuit 002 to transmit the battery 003 voltage to the low-voltage conversion circuit 002, and the second sub-drive circuit 03 is used to cut off the path between the battery 003 and the first conversion circuit to disconnect the transmission of the battery 003 voltage to the low-voltage conversion circuit 002, thereby alternately controlling the first sub-drive circuit 02001 and the second sub-drive circuit 03 to achieve forward drive and reverse drive of the two NMOS tubes to meet the working principle of the low-voltage conversion circuit 002. The second sub-drive circuit 03 can cut off the path between the battery 003 and the first conversion circuit by controlling another NMOS tube. In one embodiment, Figure 7 As shown, the above-mentioned second sub-driving circuit 03 includes: a second control circuit 23 and a fifth NMOS tube 24; the second control circuit 23 is connected to the battery 003 and the fifth NMOS tube 24 respectively; the fifth NMOS tube 24 is also connected to the low-voltage conversion circuit 002, and one end of the second control circuit 23 is grounded, and one end of the fifth NMOS tube 24 is grounded.

[0060] In this embodiment, one end of the second control circuit 23 can be connected to the battery 003, and the other end of the second control circuit 23 can be grounded, so that when the second control circuit 23 is set to a high level, the second control circuit 23 can input the output voltage of the battery 003 to the gate G of the fifth NMOS tube 24. Since the source S of the fifth NMOS tube 24 is grounded, the gate G voltage of the fifth NMOS tube 24 is greater than the source S voltage of the fifth NMOS tube 24, that is, the voltage difference between the gate G of the fifth NMOS tube 24 and the source S of the fifth NMOS tube 24 is greater than 0, and the fifth NMOS tube 24 is turned on. It can be understood that when the fifth NMOS tube 24 is fully turned on, the drain D voltage of the fifth NMOS tube 24 is equal to the source S voltage of the second NMOS tube 2122, that is, the source S voltage of the fifth NMOS tube 24 is 0.

[0061] As an optional implementation, Figure 8 As shown, the second control circuit 23 includes: a fifth driver 231, a fourth PMOS tube 232 and a sixth NMOS tube 233; the fifth driver 231 is connected to the battery 003 and the fourth PMOS tube 232 and the sixth NMOS tube 233 respectively, the fourth PMOS tube 232 and the sixth NMOS tube 233 are connected to the fifth NMOS tube 24 through a common node, the fourth PMOS tube 232 is also connected to the battery 003, and one end of the fifth NMOS tube 24 is grounded.

[0062] Optionally, in this embodiment, when the fifth driver 231 is set to a high level, the output voltage of the fifth driver 231 is the output voltage of the battery 003, and the fifth driver 231 can transmit the output voltage of the battery 003 to the gate D of the fifth NMOS tube 24. When the gate D voltage of the fifth NMOS tube 24 is the output voltage of the battery 003, since the source S of the fifth NMOS tube 24 is grounded, the gate D voltage of the fifth NMOS tube 24 is greater than the source S voltage of the fifth NMOS tube 24, that is, the voltage difference between the gate D and the source S of the fifth NMOS tube 24 is greater than 0, then the fifth NMOS tube 24 is connected to the ground. The S tube 24 is turned on; when the fifth driver 231 is set to a low level, the output voltage of the fifth driver 231 is the ground voltage, and the fifth driver 231 can transmit the ground voltage to the gate D of the fourth PMOS tube 232. Since the source S of the fourth PMOS tube 232 is connected to the battery 003, that is, the source S voltage of the fourth PMOS tube 232 is the output voltage of the battery 003, then the gate D voltage of the fourth PMOS tube 232 is less than the source S voltage of the fourth PMOS tube 232, that is, the voltage difference between the gate D and the source S of the fourth PMOS tube 232 is less than 0, and the fourth PMOS tube 232 is turned on.

[0063] In this embodiment, the second sub-driving circuit includes a second control circuit and a fifth NMOS tube. The second control circuit is connected to the battery and the fifth NMOS tube respectively. The fifth NMOS tube is also connected to the low-voltage conversion circuit. One end of the second control circuit is grounded, and one end of the fifth NMOS tube is grounded. The second sub-driving circuit can control the path between the battery and the low-voltage conversion circuit to be cut off through the second control circuit and the fifth NMOS tube.

[0064] In one embodiment, Fig. 9 As shown, the present application provides a terminal, which includes the above-mentioned drive circuit 001 and the low-voltage conversion circuit 002, and the drive circuit 001 is connected to the battery 003 and the low-voltage conversion circuit 002 respectively; the low-voltage conversion circuit 002 is used to step down the output voltage of the battery 003 through the drive circuit 001 to power the load.

[0065] Among them, the terminal is a micro device that can process data, for example, the terminal can be a mobile phone, a wearable device, etc. The terminal can include the above-mentioned drive circuit 001 and the low-voltage conversion circuit 002. The drive circuit 001 can transmit the output voltage to the low-voltage conversion circuit 002 by receiving the output voltage of the battery 003, so that the low-voltage conversion circuit 002 can step down the output voltage of the battery 003 and output an output voltage that meets the load operating voltage, thereby supplying power to the load according to the output voltage after the step-down processing.

[0066] In the present embodiment, a terminal including a driving circuit and a low-voltage conversion circuit is provided. The driving circuit is connected to a battery and the low-voltage conversion circuit respectively, so that the low-voltage conversion circuit can step down the output voltage of the battery through the driving circuit to supply power to the load. Since the driving circuit can quickly conduct the path between the battery and the low-voltage conversion circuit, the low-voltage conversion circuit can quickly convert the output voltage of the battery into a low voltage that meets the working voltage of the load, thereby improving the efficiency of supplying power to the load in the terminal.

[0067] It should be noted that the beneficial effects brought about by the embodiments of the present application or the technical problems solved are not limited to this one, but may also include other implicit or related problems. For details, please refer to the description of the following embodiments.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] Unless otherwise defined, the technical terms or scientific terms involved in this application should be the usual meanings understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "the" and the like involved in this application do not indicate a quantitative limitation and may represent the singular or plural. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A driving circuit, It is characterized in that include: A BOOST circuit, a first sub-drive circuit and a second sub-drive circuit; the BOOST circuit is respectively connected to the first sub-drive circuit and a battery of a terminal, the first sub-drive circuit is also connected to a low-voltage conversion circuit in the terminal, and the second sub-drive circuit is respectively connected to the battery and the low-voltage conversion circuit; The BOOST circuit is used to convert the output voltage of the battery into a first voltage; the first voltage is greater than the output voltage; The first sub-driving circuit is used to conduct a path between the battery and the low-voltage conversion circuit according to the first voltage when the second sub-driving circuit is turned off.

2. The driving circuit according to claim 1, It is characterized in that The first sub-driving circuit includes: a first control circuit and a first NMOS transistor; the first control circuit is connected to the BOOST circuit, the battery and the first NMOS transistor respectively, and the first NMOS transistor is also connected to the battery and the low-voltage conversion circuit respectively; The first sub-driving circuit is used to conduct the path between the battery and the low-voltage conversion circuit according to the first voltage and the first control circuit when the second sub-driving circuit is turned off.

3. The driving circuit according to claim 2, It is characterized in that The first control circuit includes a first switch circuit and a second switch circuit; the first switch circuit is respectively connected to the battery, the BOOST circuit and the first NMOS transistor, the second switch circuit is respectively connected to the battery and the first NMOS transistor, and one end of the second switch circuit is grounded; The second switch circuit is used to conduct a path between the second switch circuit and the first NMOS transistor through the output voltage; The first switch circuit is used to control the conduction of the path between the first switch circuit and the first NMOS tube through the first voltage when the path between the second switch circuit and the first NMOS tube is conducted, so as to conduct the path between the battery and the low-voltage conversion circuit.

4. The driving circuit according to claim 3, It is characterized in that The first switch circuit includes: a first driver and a first PMOS tube; the first driver is connected to the battery, the BOOST circuit and the first PMOS tube respectively, and the first PMOS tube is also connected to the BOOST circuit and the first NMOS tube.

5. The driving circuit according to claim 4, It is characterized in that The second switch circuit includes: a second driver and a second NMOS tube; the first end of the second driver is connected to the battery and the second NMOS tube respectively, the second end of the second driver is grounded, the second NMOS tube and the first PMOS tube are connected to the first NMOS tube through a common node, and one end of the second NMOS tube is grounded.

6. The driving circuit according to claim 3, It is characterized in that The first switch circuit includes: a third driver, a second PMOS tube and a third PMOS tube; the third driver is connected to the battery, the BOOST circuit and the second PMOS tube respectively, the second PMOS tube is also connected to the BOOST circuit and the third PMOS tube respectively, and the third PMOS tube is also connected to the battery and the first NMOS tube respectively.

7. The driving circuit according to claim 6, It is characterized in that The second switch circuit includes: a fourth driver, a third NMOS tube and a fourth NMOS tube; the first end of the fourth driver is respectively connected to the battery and the fourth NMOS tube, the second end of the fourth driver is grounded, the third NMOS tube is respectively connected to the fourth NMOS tube and the battery, the third NMOS tube and the third PMOS tube are connected to the first NMOS tube through a common node, and one end of the fourth NMOS tube is grounded.

8. The driving circuit according to any one of claims 1 to 7, It is characterized in that The second sub-driving circuit includes: a second control circuit and a fifth NMOS tube; the second control circuit is connected to the battery and the fifth NMOS tube respectively, the fifth NMOS tube is also connected to the low-voltage conversion circuit, and one end of the second control circuit is grounded, and one end of the fifth NMOS tube is grounded.

9. The driving circuit according to claim 8, It is characterized in that The second control circuit includes: a fifth driver, a fourth PMOS tube and a sixth NMOS tube; the fifth driver is connected to the battery, the fourth PMOS tube and the sixth NMOS tube respectively, the fourth PMOS tube and the sixth NMOS tube are connected to the fifth NMOS tube through a common node, the fourth PMOS tube is also connected to the battery, and one end of the fourth PMOS tube is grounded, and one end of the fifth driver is grounded.

10. A terminal, It is characterized in that The terminal comprises the drive circuit and the low-voltage conversion circuit according to any one of claims 1 to 9, wherein the drive circuit is connected to the battery and the low-voltage conversion circuit respectively; The low voltage conversion circuit is used to supply power to the load after stepping down the output voltage of the battery through the driving circuit.

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